And charles e



Nov. 27, 1923.

N. G. PERRY ET AL LIFTING JACK 2 Sheets-Sheet 1 Filed Sept. 14. 1921 Nov. 27, 1923. 1,475,864

N. G. PERRY ET AL LIFTING JACK Filed Sept. 14 1921 2 Sheets-Sheet 2 Patented Nov. 27, 1923.

UNITED STATES PATENT OFFICE.

NATHAN G. PERRY, OF LOS ANGELES, CALIFORNIA, AND CHARLES E. HULTING, OF N'OGALES, ARIZONA.

LIF'IING JACK.

Application filed September 14, 1921.

To all whom it may concern:

Be it known that we, NATHAN G. PERRY, a resident of Los Angeles, county of Los Angeles, State of California, and CHAnLns E. HULTING, a resident of Nogales, county of Santa Cruz and State of Arizona. citizens of the United States, have invented certain new and useful Improvements in Lifting Jacks, of which the following is a speci fication.

This invention relates to an improvement in lifting jacks.

The present invention is of the general type in which a right and left thread is used in connection with toggles. with a base for the pivotal support 01 the operative parts, and a. head block constructed and adapted to have a slidable bearing upon the upper ends of the toggles, so that any weight and strain is removed from the pivot.

This lifting-jack is designed to give efficient service under severe strains. such as raising a vehicle when mired in soft, gummy or sandy soil, or a wrecked wheel without the necessity of blocking, as with the ordinary jack, the present jack being constructed and adapted to raise a load a distance equivalent to about 140% of its own height or from its lowest point, all in one operation.

A further object is to so construct this jack that the weight and strain is thrown upon solid shoulders rather than upon the pins pivoting the various parts together.

In the accompanying drawings:

Fig. 1 is a view in side elevation showing the jack in raised position in full lines, and in lowered position in dotted lines;

Fig. 2 is a view taken at right-angles to Fig. 1;

Fig. 3 is an enlarged fragmentary view of the upper end of one of the toggles;

Fig. 4 is a view of the head block upon which the weight to be raised is adapted to rest.

The numeral 1 represents the base, from the center of which is erected the verticallydisposed stay-column 2, which latter has an elongated guide-slot 3 extending vertically therein.

0 The lower toggle 1, of which there are two as shown in Fig. 1, (and preferably in the form shown in Fig. 2) are pivotally connected with the base by means of the pins 5, and these toggles have lugs 6 extending downwardly, to which the stay-rods 7 are Serial No. 500,639.

pivotally connected by pins 8. These stayrods extend inwardly on opposite sides of the stay column where they are connected together by the pin 9 extending through and guided by the elongated vertical slot 3.

Upper toggle joints 10, of which there are two, shown in Figs. 2 and 3, in the general form of the letter A are pivotally connected with the upper ends of the lower toggles 4 by means of the trunnion-blocks 11 and trunnion-pins 12, which latter are integral with the trunnion-blocks and extend through the holes in the ends of the toggles which are held in place by cotter-pins 13. These trunnion-blocks are provided with internal right and left threads, and the right and left screw 14: extends therethrough and turns therein, it being provided with a movable crank 14 capable of being placed oneither of the squared ends 15 of the right and left screw, whereby to make it possible to operate the jack from either end, or from both ends at once.

The head-block 16 is slidably and pivotally mounted at the upper end of the upper toggle 10 by means of the pin 17, and this pin is guided vertically by passing through a slot 18, as shown in Fig. 4.

The head-block is provided with a tail piece 19 at its lower end forming a stop 35 against which the upper ends of the upper toggles 10 impinge when the jack is raised to its highest point, as shown in Fig. 1.

The projections 20 and 21 at the upper ends of the upper toggles form lateral support for the upper end of the opposite upper toggle, and for the hcad-block as shown in Fig. 2; and the shoulders 22 form supports which have sliding contact with the rounded lower edges 23 of the headblock, so that all weight and strain is borne thereby rather than by the pin 17, which is one of the advantageous features of our present invention, thus transferring the strain from a comparatively weak part to one that is capable of withstanding wear and tear.

In this way, we have provided a powerful, durable, quick-acting lifting jack of simple construction, easy to operate, and not likely to get out of order.

We claim:

1. A lifting-jack including upper and lower toggles connected by trunnion-blocks and pivots, a screw operating therein, a 110 heed-block resting; slidehlv ends of the toggles, end the -l1eed-block vertic. with respect to the top; le.

2. A lifting-jack ineln lower toggles connectet U ,r and pivots, right and left scr therein, a heed-block restin sli. the upper ends of the to pin for guiding the its movements with poet to the 'too'gle.

3. A lifting-jack including it bese heel block, two sets of tog l trunnion-blocks a d A s, the toggles pivoted to the hose, slidahly supporteiil and guided ends oi. the upper toggles, ent for guiding the head-block movements with respect to the i at. A lifting-jack including block, upper and lower to blocks and pivots cminettin 4- q upon tee upper v and it right and left .l g through the trunnion-blows tor unwitting the lifting-jecks the heart-block having sliding support upon the uppe ends of the upper toggles, the upper tog having projections which form leterul port for the upper end of the opposite toggle end for the head-block.

5. llfllln ecl: including :1 base, a head block, upper end lower toggles, trunnionblocks and pivots connecting; them toget ier intense a, right and left screw extending through the head block having sliding support upon the upper ends of the upper toggles, the upper toggles having projections which form lateral support for the upper end of the opposite toggle end for the head block, the head block having vertical slot end u pin extending through the slot and pivotell connecting the upper ends of the upper toggles together.

6. e lifting-jack, the combination with base having a vertically slotted stay column, upper and lower toggles, trunnion bloclt and pivots pivotally connecting the upper and lower toggles together, the lower toggles pivoted to the base and provided witn lugs, stay rods extendingfrom the lugs in the direction of the stay coluini'i, a pin extending through the inner ends 01 the rods and through the slot in the stay column,

slotted head bloclr resting slidahly upon NATHAN G. PERRY. CHARLES E" HULTING.

ill 

